[edumazet@google.com: Re: [PATCH] x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task]

[edumazet@google.com: Re: [PATCH] x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task]

[Ingo Molnar]

hi Greg,

Please apply upstream 8ab49526b53d to all stable kernels containing 
07e1d88adaae, which should be v4.20 and higher stable kernels.

Thanks,

	Ingo

----- Forwarded message from Eric Dumazet <edumazet@google.com> -----

Date: Sat, 15 Aug 2020 10:38:58 -0700
From: Eric Dumazet <edumazet@google.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel <linux-kernel@vger.kernel.org>, Eric Dumazet <eric.dumazet@gmail.com>, Jann Horn <jannh@google.com>, syzbot <syzkaller@googlegroups.com>, Andy Lutomirski <luto@kernel.org>, "Chang S . Bae" <chang.seok.bae@intel.com>, Andy Lutomirski <luto@amacapital.net>,
	Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>, Dave Hansen <dave.hansen@linux.intel.com>, Denys Vlasenko <dvlasenk@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>, Linus Torvalds <torvalds@linux-foundation.org>, Markus T Metzger
	<markus.t.metzger@intel.com>, Peter Zijlstra <peterz@infradead.org>, Ravi Shankar <ravi.v.shankar@intel.com>, Rik van Riel <riel@surriel.com>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task

On Sat, Aug 15, 2020 at 4:48 AM Ingo Molnar <mingo@kernel.org> wrote:
>
>
> * Eric Dumazet <edumazet@google.com> wrote:
>
> > syzbot found its way in 86_fsgsbase_read_task() [1]
> >
> > Fix is to make sure ldt pointer is not NULL.
>
> Thanks for this fix. Linus has picked it up (inclusive the typos to
> the x86_fsgsbase_read_task() function name ;-), it's now upstream
> under:
>
>   8ab49526b53d: ("x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task")
>
> By the fixes tag it looks like this should probably be backported all
> the way back to ~v4.20 or so?

This is absolutely right, sorry about the lack of a stable tag.

Most of my patches usually land into David Miller trees, where the
stable tag is not welcomed.
We use  Fixes: tags to convey the exact information needed for stable backports.

Thanks.

----- End forwarded message -----

Re: [edumazet@google.com: Re: [PATCH] x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task]

[Sasha Levin]

On Sat, Aug 15, 2020 at 07:46:40PM +0200, Ingo Molnar wrote:
>
>hi Greg,
>
>Please apply upstream 8ab49526b53d to all stable kernels containing
>07e1d88adaae, which should be v4.20 and higher stable kernels.

I've picked it all the way up to 4.14, as 07e1d88adaae was backported
that far.

-- 
Thanks,
Sasha